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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd3d66a2d48343994c2cbe301fbb4fbf0d19c89bf51d1c3e1befbdbc58dee61' 
  AND token = 'eBm7UES0HiCSLybKm/1AhFxi98FDn9wf29VyXZoeTmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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