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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b4541ea2542e33417d9ecd1bd2e4ae6b99d44afba8b251f02472ba8334db41' 
  AND token = 'VD2b9ZWX39L24jMOmOr4jrGlnAsM4jXvKZHyvkOQkp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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