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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c71b0987a965808f7f8579b04454bd25627095e990302ffee8668380e990c3' 
  AND token = 'YjtVZ+O4BpLO5uzJHcCS4JPv5UsAJQeEDf01q1tR7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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