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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da649eb180627262f9790c1f4ad7232671e9f2c4e5e0cfa264aae666814807fc' 
  AND token = '8RhUc8HpVmvmjOjtoiKjrRkeAOZNlX4evYLB9FzWCaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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