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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4810773dbbef0dcea83007cef9948d51bfdb62d32cc6650b3d082a77f6662c2' 
  AND token = 'gF+a4lHf6dMmWsgshDewxXsM0ru5ykkMM8G614Q4egs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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