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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2913ea4294cf7b5902b81e99f6eaa23dc7fe7e93abb519041a5d0fccb661833c' 
  AND token = '62LX4OMjN1G82dopqh7M5ARu103AXv2QgjWxUW0E7G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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