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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9922071e8906b8c304e2d7cb8a9aee57c78ee0b5b54f820192c4cc22fda5e9c' 
  AND token = 'CvXxpxF5G/egonPSmPxlMTOWUqLoWTh25h878/jEGsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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