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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74ed680f806ca85de413ab2b8dc31d8f30cc610186e7e01aa2fc586d34ab919' 
  AND token = '1anx6ZsqwEPBEltczI0d1T2k5/K9jzMFxyoq/JtGxFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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