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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2fcd1d0e8970bf03f1abd9d177bdc370eaa43f294b99ea2a6cacc75f351b69' 
  AND token = '9cG89k4od6G2F4hJQvrkzO1J1uRGCYPOdSaoM28z2bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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