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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb83c7187959563bd2c37c6e795113bc0b2e8a234f3e12bf8a2443c0641fa5a' 
  AND token = 'ihBt76ej028LkW4xb+2fw3nbb7p+EPqCKKYbB91TYcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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