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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b3b46ec3e4e24f2b10788d35c125b29677a1c65d38f5aaff39766134302a07' 
  AND token = 'KbHfJrozekz82EabZS4ymgYB0CJdJENo/kjHcAEHHWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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