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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28e171f3ce92fd57f7f7e4ac9e8475f28b8c587fbaecfc2142b525684962103' 
  AND token = 'dqwJ+Xr42RNPHJSLAT+JWf2sVHh1AEdaqJZ3q0ZfT/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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