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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c575d6ceb884b5e82f5db544c1cf9b3464159d06c4d5b13c63db8e32e41e2e59' 
  AND token = '5e1O6WpWcj2wLAsol/JpHCW13KNjououWxuXpkvm8Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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