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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ed569bd893ba0ba98d6cd52b17b91948e937bfa7acf17aa162cf6ca3ea0bf1' 
  AND token = 'u2Gv/bZJBoTIP5snoLU1eTyXFDjJ5vpnw/dos1c7T6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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