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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0193e48568a8eb17d4bd1e311c8a6bcce1c8f59ca667ac0059852844df91064f' 
  AND token = 'cn41kcZRg/gL0U0fP+9Jeg29+xTYt86/LMg0C6W/pqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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