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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5a8b76762d2cbe4f4643b1922d61e00df9e19425db5c4da27b0d75ca5f1507' 
  AND token = '0EmfQRE/VBRleBRtjHkOQUdknBroZrV2uy9nFlr3uyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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