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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac60c9e86ed63a87f2bb4926f54695d5d2d413c9dabf414eef7a5f24e4ae42b' 
  AND token = '5OtUCahsuOeaeuLB3G9ot2YD5y5wgwhcYRdyHvKaaf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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