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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08348364d5bd20899258a15eacbd4b9534ef73f596a2b8c525e6c8209367ad5' 
  AND token = 'MHjXav5LPcVZ8HI2Ge9SsWihGBnqMXeII188F0xmMuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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