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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dc9aff956d63c0a8139c8c52b968d8132662ace6c181b0cfa722d7483d0073' 
  AND token = 'jfjAIWxxJkm19kg9LOZ3oqkPEvH9k4F4DbVNqIdJgdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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