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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c00c2bb2be27031b87fd554589d912b1a6bc9cd80889056851c6d919700459' 
  AND token = 'YnJBD3gD8uM3cezX0pzlaFrYRphAKls2yifDcqVHxLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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