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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9e0f1809d8c29baf4d8a3229f6dcb1c3fe49e667b526eec0b5d09290c98b01' 
  AND token = 'XKu622CcBdjL4qsZvFhXiueV4H9ygh0V+kHw4DCxhVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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