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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ca9805957e83838acad4c2f9557b7916e751c30001a75a0b7974be308123bb' 
  AND token = 'gvHbPkOLMX8pKsYQSV8NyrVXWfEWsw0lp0nfBr+FkXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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