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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9250532cf23cedb53d4abcd20454bbf39eb9f907255ab606914b55b14ba2c73' 
  AND token = '/9op/yslR75trAj3Iamv+UKixEm6wveg/wHmBdH4IK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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