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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a4e7ee713b5e14385412462a8aa6028cde3da82e891b8cecb01244dd736f6c' 
  AND token = 'Ntl2YQKFYKtwKidmWF/qlJdCZ8LjU0xH3OT9sb5AKSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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