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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e24e407625a0efa6ded59aaed9855bbaa8ce5372ba06b7507171930ca74c49b' 
  AND token = 'fwLf5+1SwnhfOkt6FUKTnsFkqTEvpDaGhgz/l03m+Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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