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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0522d8d2e930e8d00f9ef84bfed93909797cb4159401847a066a2d36d366929' 
  AND token = 'PGZJh726JSTQzCoBM3qyIW4RMEu4CfRKCPmZYT6SKM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}