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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1fdee4ad3fb15c1161d8034ab86ceff194302a471906ef11387d905b25adcb' 
  AND token = '3BOH12Oer6Qeq9/WOG7KPr7fAoSKcfU1PVh2ltSEmqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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