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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b644ec22744fc202064ef1c734be38be9ae56f76480f9931c5e56b6f3428ff58' 
  AND token = 'rtSKt1w4TZTqm1z8/FmWRFJLiX7HKdtJ0oX5MLR1Kk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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