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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91367c2fd35c7e730b67b6ac26e49cca1077675113457b1dba9eeb54e889924b' 
  AND token = 'e5PPlyaF7WlPZ+NkEi327irJgJtRDYWOdvLbGsBqbIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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