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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df25488c9a38c3848d9f08bb0df64f6afa425b7529d737220b9d6095fdecbe18' 
  AND token = 'Qcbbj32jchd836IOSsqCVe1XnfciWvYJQRhO0VvkkuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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