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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d02fdfbdfd2b37d94030065c7be2898f360447e2028cc42a52559f26050787' 
  AND token = '0OGQDDwQSYZU1oLKTFLb0X2qsku+NbEThoX8xseE5vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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