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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb693ce546df7685103f7b247011985d9e829e45f6df86b8905c1a1d0ef5255' 
  AND token = '79e6Y96zzCV20jnGbkJgCd3aeHhyH/CoWzYqUBPs3bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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