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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a8ef2863d5203105c2a174c6993d17ffdec7a0a9b9593e971da084f1abeafa' 
  AND token = 'Ioy5E6MwUVgc3LOACpQLm5dw4pjn1/IJ5CIILOXcn4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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