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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883dda4bc8e083dba9ac271dd18960a0e3eec1c0bc8033698d1da2147d6f4253' 
  AND token = 'tUpcsR4RR2USH6vnN3ZD4xxV/X8XJaFalyoXCfsn0N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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