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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edace8d20a66448f2e8eac8f0876880e75172031f9aad010d763c503b4237f7' 
  AND token = 'jRdcK1v1WGCBiP7VruH7wzJNx3NfSQ1wmeeNI3SDQUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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