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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e9a2bb940c0b18f57b77082cf0e0136aba3e391e7e633afca39b8569779ba0' 
  AND token = 'gQA/JvC1UhdWQMi0OVtXhKsO7c5/yDSwb9UBFpTAiTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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