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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ab30f851a4f144f53438e116bc049a3b9d6197b01c27b6cece8c0b4d1c31ff' 
  AND token = 'dB8gYvfd8nbQOT8got7xeKnXYArkRxOPwx93fX6NPVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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