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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf48305eec8784ba45a5eb359f4e463623ae42c8a66b9415b0a9a264efe344b0' 
  AND token = '/iDvwZtKeDBRKZIEN6x5r/TlmWbMTl4/7r2PYrqumFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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