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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cb0b5159524f7a84f9234f3d845df220ad08aaf5a8066a6ee933c4a74c351d' 
  AND token = 'm2hNHSuH0m201FLxEBRH/8nTYm+d4kp+kqcZ1hDqaQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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