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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79178b71c62da1da892ad2bc47d5c0f1dcb01aadb130e484adbb39b5325c94f' 
  AND token = '6P5oKN1M1t/TtobxMynKfR2hh+xKAYpaMPkbuCYV0Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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