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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44762c38446cfff18df2b867d07adfc6dc7baeb933c8c34ab43e4c6bb8a944ad' 
  AND token = 'mM9DBHgz/Omr6Y1oudcc+4Omkldq81iMK3m04vdMiZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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