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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f9fddfda9ce1a0a4f349688357dd7cdcde845f6a6e031f0f297834b49f0c3b' 
  AND token = 'L88GHoOtLEN2ug/HsDpDKWe/5ayM23RuI9xb60RGzkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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