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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283b0fe5dc987ce42d026bf5fa95f51fa46f95e23bf1b644e43a0b46a30dfa1c' 
  AND token = 't/LZeK/DeXtolyaOKi7gAhKhdEgzbdD0ggm7r/D8WcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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