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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507d22129306b1f5972878fe653de49909d80736a5fc6ef5e34c4b0416cfbb40' 
  AND token = '38Xw7yeUGIvitv/SsbTqpTnCxwFokK0/QXrMfQvGRZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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