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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b61a8e60798b9349d779dbd165ec789827829c8aa452296c00d491a1c79edc8' 
  AND token = 'w1Gsxd1EcZAL13WWTI9AWII4KKtsGE+XGQCQ8qIAsMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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