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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a1c19a831d98cc9f6991c250959a68a6fdc62a4d42ad48ab782f3c5e4092ee' 
  AND token = 'EfF6FaD37gSxCVucoZoPgoeVdqmokcDHXFceWqCZP2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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