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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1decfe1edfbff1921c4f3e0ceadbb301cc0606b6fae71d4e6c872064317f46c' 
  AND token = 'QU/0BbB5PTB5VyWQzKrCT8FQW5EWMsBREO4AZV6XES0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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