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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4f9ded9d4b8aef0912412fe40fb4df67688cad22ff08c31885524663e58107' 
  AND token = 'K127MLDrhpmF2E9LjgR+UgCjCRAQt2u6op6rGRQU/hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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